doug
you are not entirely correct there. you don't just go and turbo any bridgeport or peripheral port motor or else you will be left with an overlapping pig of a motor. there has been a lot of r&d into turboing these things and you can all but eliminate the overlap issue by the positioning of the actual ports in the housing for a PP or the plates in a bridgey. turbo bridgeys are becoming more common for street cars as the australian builders put more time into development... speak with Jon from RX Engineering in newcastle if you want more info, he is building plenty of them at the moment and is well respected in the PR scene (turbo BP motherland) for his top notch tuning and engine building (they fly him out there all the time)
any PP or bridgey will need to be freshened up regularly, the PP even more so, however people are now testing small 'bridges' over the peripheral ports which stop the apex seals flexing so much over the ports and causing the fast wear that we all know and love. just like the 'rotaries are unreliable' myth, the 'big ports can't be turboed' and the 'ported rotors need a rebuild every 500m' myths are fading away as more r&d takes place...
to cut a long story short :
NA bridgey/PP motor will be built entirely differently to one that you want to run with a turbo applications, and a turbo BP is probably even more streetable than a NA BP because of the way the ports are set up, not to mention quieter
there is a lot of info on the internet about this, it makes for a good read, you might find it interesting